I wouldn't worry too much about it. It's an attempt to be a gracious loser, and maybe a promise to try and test you again next year. I just choose to accept similar phrases that way. It keeps me out of fist fights.
It's a euphemism, but it's also statistically nice (I say that as a statistician--the mathematics kind). One game result is just a piece of data and mathematically it really doesn't PROVE who is better. Plus, we've all seen games where one team won big in the first matchup and then in the playoffs it flip-flopped (see Giles and Glenvar).
I don't have any problem saying your team is better than my team, when your team beats mine. I am not trying to make a mathematically specific statement, and it's probably easier for me to say that than for some people precisely because I know exactly what one game proves.
I am excited that Bird won the last three state championships, for example, but I am under no delusion that they would beat 2012 Ocean Lakes, 2013 Briar Woods or 2014 Tuscarora every time if they had played multiple times. I'm just happy Bird seemed to have the play when they needed to.
If my team wins, there's not much you can say to get under my skin, if we lose; I'm certainly not going to talk trash. I just accept the win and throw out some numbers every now and then that I think makes my team look good, but you don't have to believe I would beat you the next time, because I beat you this time, and this is the only time that matters.
I do feel like football players should have a lot more respect for one another. You all endure the same kind of stuff and nobody understands what you go through like another player. Shake hands when it's over, say good job, and get about the business of being even better next year. When you get to be my age and start talking about what your football team did in high school you get a lot of looks like you're Al Bundy.