PUA is perhaps a very specific term. I just know some womanizers, with an overall genuine respect for women and who seems more 'used' than the other way around. I suspect in normal life PUAs are like that. They just put up a macho facade, because the net is what it is. I mean, the dude offered all his benefice to the local rape-awareness-charity once he got called upon. And the girls seems to like him -before they learned he was ranking them-. Is nastyness seems a fruit of vanity; proud born from his 'sucess'.
There are people who wear the PUA label with pride, and they're generally problematic in mixed company. And yeah - PUAs might be "normal" in real life... but they sure can stink up the Internet. Nastiness you don't know about is all the worse when you do.