We all know by now the old saw about what happens when someone introduces a statement with "I'm not a racist, but…" and over the last few years I have come to understand that a man self-identifying as "a nice guy" is equally ominous. It makes sense that it would portend something awful. How often is "nice" used in a way that isn't passive aggressive or pejorative? Think about what you mean when you describe another person as nice. You mean they are boring, so boring that you can't think of an actual quality they possess. When you had a "nice time" at something, did you have lots of fun? And in what world would you want to lead by describing yourself to another person as nice? I'm not nice. I'm polite, but in common usage "nice" means saying a lot of flattering things to someone in the hopes that they will do what you want them to do.
The clearest warning sign is that the men who are always telling everyone what Nice Guys they are inevitably fall into one of a small number of categories. Some are young and awkward, too immature to really understand how romantic and sexual relationships work and of the belief that they are owed something by the women of the world for being friendly. Hopefully they grow out of it. Most are the ex-fratboy "Learn How to Pick Up Any Woman!" types who think that they are so much smarter than women, despite all evidence to the contrary, that women will fawn over them in response to 20 minutes of pleasantries and a cocktail. These people are so transparently awful that the phrase Nice Guy, as their chosen descriptor, is indelibly tainted by association.
There's nothing I get a bigger kick out of than the hundreds of posts seen weekly around the internet about men trying to pick up women on dating sites and apps (Tinder, OK Cupid, etc), introducing themselves as Nice Guys, and then immediately going psychotic when their advances do not receive a prompt and positive response. To wit, from Tinder's Finest Bachelors, we have one of the internet's most entrepreneurial and self promoting wizards of pickup artistry going from "I am such a nice guy! You should meet me!" to "You should be happy I am acknowledging your existence you whore" in like, ten minutes. This is curious, as it is not the kind of thing I would classify as Nice nor is it something a legitimately Nice Person would say.
When I lived in Madison, WI I grew wary of the downtown homeless population. Having lived in Chicago I was not shocked to see homelessness, nor am I prone to spiteful reactions toward them. But I learned that some of the homeless people, either due to mental instability or strategic planning, would flip the hell out if you said no when they asked for change. "Have any change?" "No, sorry, not today." "YOU MOTHERFUCKER I AM GONNA RIP YOUR FUCKING THROAT OUT IF I DON'T GET…" etc etc. This made me, unfortunately, apprehensive about interacting with them. Usually I try to treat homeless people like People, looking them in the eye and exchanging words with them rather than trying to avoid them out of shame or whatever. After a couple of them lost their shit on me, though, I became a little more actively evasive.
Being a woman on an internet dating site can't be too different. It's a minor miracle that they talk to any of us, ever.