"Generally" is not translated into "100%". I called him a nerd and in some cases being a nerd is a good thing. You can not say it is not very nice, since you do not know my intentions.
I happen to know Mairuzu- at least vaugly- and in my definition he IS a nerd. Even though so is the case, I love him and I can think of nothing negative about him. By that, I consider my nerd comment a compliment.