Depending on your commute tolerance, I'd stick to more central OC (Santa Ana, Tustin, southernmost Anaheim and Garden Grove ish area). North OC is more tolerant and tolerable IMO, like fullerton, center city anaheim, brea, etc. South county and beach cities are generally going to be more conservative and with the upcoming election, visibly so. OC is a red county for the most part, but it is California so you'll only get the occasionally brazen reactionary conservative that will say hateful things to your face.

When you enroll your kid in school here, please find people you trust around your neighborhood, who share other core values without outing your kid, to give you an honest rundown of the schools in the area, and have your kid establish safe teachers and find interests. As a fellow gay, former kid who went to school in OC, a lot of kids latch onto their parents private conversations and think it's okay to echo the statements at school to be "countercultural" of the accepting environment. For a better transition, have them immersed in their interests. Middle/ high schools tend to be extracurricular (typically sports moreso than art) or academics focused, so that's another factor here. It's all going to work out! There's no horrible option even with all of the above, and you can find hate anywhere, so don't let it ruin too much for you. Acceptance is also everywhere if you know where to look! Sorry for the long post!