It's not an insult...
Tell a man you know that you think he's a nice guy and watch his reaction. He will usually look at you like as if you just shot him full of lead. Why? What is wrong with being a nice guy? A friend of mine hates the fact that girls tell him all the time he's a nice guy. I don't understand why that's an insult.
There's nothing wrong with being a nice guy. Growing up as little girls, we're told to wait for our Prince Charming. That's what many women are looking for. What girl doesn't want a man who is sweat, caring, respectful...you know an all around nice guy?? But don't forget that Prince Charming often fought beasts, killed dragons, beheaded witches for his love.
Don't be a candy-ass. If you get told you're 'too nice', then you're being viewed as a push-over. Women like nice guys, but what we don't like are push-overs. Being nice doesn't mean you stop being a man. Handle business, take charge, make your woman feel like she is safe, protected and secure. Have a thought in your head; an opinion. Don't be afraid to stick up for yourself and for your lady. And if you do meet a girl who doesn't like nice guys, watch her....really....I mean it......something may not be right in there.