I think it sounds like you need to work out the difference between being honest and being rude (I love honest, can't bear people who have a front where you feel like they are pretending to be something they aren't) but there is a fine line and for me someone clearly switching off or being demanding about how I talk would be off putting. Also you come across as being rather self-absorbed/self/centred, everything you say is about what YOU will tolerate or want.
My closest friends are a mix of both women & men and parents and non parents, just lovely people. I have a lot of friends who like hanging out in a big group and others who prefer one to one. I'm not a fan of baby groups or the school gates but writing every parent off as boring is ridiculous, they are still people but all you are seeing them as is parents, which is really judgemental - imagine if that was all they could see you as? I've met some amazing friends through my kids. I also don't do inane and I am very academic - not needy (can't do in your pocket friendships, I back off from people who feel the need to spend every minute with you or text all the time),
From your posts though OP it sounds like if you actually want to make friends you will have to show an interest in other people - listen to them, let them tell you their stories, they might actually be interesting. Being serious, inpatient (which is a sign of intolerance) and judging everyone is probably really off-putting. Keeping friends is much the same, have fun, be interested in them and maintain whatever level of contact you are both happy with - also do stuff together & have fun.
There are people I meet who I think probably won't be 'my people', but giving them the benefit of the doubt can surprise you in the nicest way sometimes.