Playing to win is not mutually exclusive with fun. Don't be 'that guy'
Of course it's not. But some people will make the same mistake in the reverse. They believe that anyone who is playing to win, is automatically not interested in having a fun game.
There is IMO two types of games. Competitive and friendly. All 3 of them can be quite fun, but the attitude you approach each with is going to be different.
If I'm playing a friendly game, then win or lose doesn't matter all that much. If however I'm playing competitively I'm going to play to win. In either case I can have fun, and in neither case should I be a jerk.
But no one should expect to play in a competitive game and not have the other person do their best to win. But again around here, sometimes Playing to win, is considered to be the same thing as playing to Win At All Costs.