Sure - I'm going to go against the grain here. I don't think the other women were 'clinging' to their husbands (how sad, if they were!) - I think you are projecting your fears and insecurities out there. Much like when I bought a red car (so sporty! so conspicuous!) I saw red cars everywhere. I'd never noticed how many there where..... Anyway, now that you are looking, you see husbands/wives/families everywhere.
You are a little family by yourselves, you and ds. You don't need anyone else. I'm not minimising what you perceived it as, but honestly, do women pull their husbands away from 'single' women? I'm a single parent, have been for 5+ years, and I've never seen anyone nervous around me and their husbands. (and I do go out, singly, with couples) Not sayng it never happens, but you do not need a MAN just to vindicate yourself. You are a family, you are your own person, you do not need Ex, or 'him', or anyone. Only yourself, and ds.
Re the 'snubbing', I have a PFB who is quite content with one (1) friend. All through school, I had the mother of the 1 friend to talk to, so at assemblies, nativities, activities, if she wasn't there, I was on my own. It's not nice, it is cringeworthy, hurtful, and I felt like I had a bright red face, or 2 heads or something,all the way through these things. BUT - ds1 is (probably) mildly on the Spectrum, and if nothing else, he has taught me to NOT Care too much about what others think (he certainly doesn't) and that everyone else has a)the same insecurities, and b) also worries about what others think!
Re your ex - I read your account of that day with horror. If nothig else, Sure, please don't ever put yourself in that position again. if ex suggests a day out again, say no. If anyone tries to guilt-trip you into it (ds would 'love' it...) - remember how you were trying to argue, scream and cry without ds seeing! It is not good for him if his dad is controlling and bossing everyone, and abusing you at the same time. It is not good for ds to have his concerns and fears and feelings disregarded simply because he is a child and the dad doesnt think it's important. If DS has to see his father, then that is his right. You don't.
Sorry for the mammoth post! I'vebeen away and missed loads.
Hope you are feeling oK today.