Afraid of butt cooties?
No, more afraid of AIDS, HIV, every other STD, tentinus and the general layer of filth that coats the literal shitholes.
You can't get AIDS or HIV from toilet seats...unless you have a gaping wound on one of you ass cheeks and there's some fresh, HIV infected blood covering the seat. Then you might be able to contract AIDS.
I don't know about other STD's but I have never ever heard, form a relaiable source, of a confirmed case of someone who definately contracted an STD from a toilet.
I know this. I've seen bloody public toilets, and I've seen public toilets with sharp broken parts and rusty, sharp broken parts, and at least one bloody, rusty, sharp broken part. I've also seen them covered in shit, piss, puke, a mix of the three, bloody puke, and things I don't even know the identity of. I do not like public toilets. I do not know where your ass has been, or where the last twenty thousand asses were.