I feel really defeated when dealing with neurotypical people, it is exhausting.
I have a few thoughts on why this contributes to why so many autistic people are suicidal.
Women with autism are more likely to have PMDD, which for many means that suicidal thoughts come more strongly for two weeks before your period begins.
They tend to have really rigid cliched ignorant stereotypes of what autism is and are dismissive if you don't fit into their box; this is incredibly invalidating.
They tend to act like it is stronger in children then adults, they expect us to act like they do and do not fully grasp what it means to have a different neuropathy of brain, (dunno if that's how you would say it!

) but we do not think in the same way and in many environments we have to consciously try to think how would a NT do this, i.e. masking/camouflaging. Which is a completely unfair expectation to have on autistic people, you wouldn't expect someone with a body disability to be able to perform in the same way as someone who doesn't have a physical disability.
Because NT tend to be hierarchical and plays a big part in how they socialize, when they find out or know if you are autistic they will subconsciously see you as 'below' them, which is a horrible feeling especially if it repeated in a lot of interactions, I can imagine for a lot of autistics it can chip away at your self esteem and make us more uncomfortable with socializing, I think it might be a type of prejudice or discrimination but unlike most instances for example racism and homophobia is a lot more subtle/covert leaving the autistic person feeling confused and powerless. I have found they may treat you dismissively or aggressively or impatiently like they are annoyed by you or they are very sympathetic but unfortunately condescending.
I have noticed that it is still pretty common to make fun of people who NT's deem as retards and special, I think bullying is just as common in schools and in the workplace, which is no wonder why so many autistic people struggle with working a job, that and most places do not/are unable to understand and accommodate our needs. I know some people use these words as a term of endearment to each other and not towards autistic people and not to hurt but
I know most of these behaviours are subconscious and are wired into NT's way of perceiving the world, but that doesn't make it less traumatic for autistic people.
I think autistic people are more targeted to be manipulated and taken advantage of leading to more abuse/trauma and/or less interaction with socializing.
I think a lot of autistic people are seen as too 'high functioning' (I really don't like this terminology) to get given support and so struggle.
I think depression is common for non-verbal autistic people and ones with more support needs that are in care. My brother was briefly a carer during the pandemic who cared for some autistic adults and said most would have a very sad demeanor, not want to engage and wanted to stay in bed and would have meltdowns quite frequently which proves that they are stressed and they would try to run away a lot. I know it might depend on the type of care but it is still heartbreaking, it must feel like a prison to them.
For me, I think one of my biggest struggles is being treated like I'm not human or there is something wrong with me, also known as the uncanny valley effect. This is when NT's without knowing you are autistic can tell something is different or off about you because of your behaviours or the way you speak, they may be repulsed, uncomfortable, creeped out or find you cringe, it can be feel horrible to be dehumanized.
There might be more reasons but can't think right now, also I do waffle on a bit.

Here is survey that is being done to find out how to support autistic people who are suicidal. It might be too late for some of us here but at least maybe it's a start to being better acknowledged and understood.
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