Lets flip this around....
Does this guy care if you find it fun to have someone that uses nothing but assaults and long range weapons try to steam roll him, all while you tie yourself up to act like a punching bag for him?
Nice or not, why are you so concerned about his feelings? What I find "fun" is a fair game. A fair game being defined as a game where we have an equal amount of points to create our force. A game that is not being manufactured for someone to win by modifying the rules, which includes throwing in insane house rules and or TacOps rules that are stacked to favor the other player; an example would be the piloting skill roll modifier that puts lights at a disadvantage, the rule about missile spread at long ranges while ignoring damage reduction for energy weapons.
Personally, all of this RPG-tech seems to breed squishy feeling syndrome where people shy away, if not outright protest against a competitive game. Its a war game, if its not competitive then you might be doing it wrong. This guy needs to get hammered by indirect fire, hes begging for it. Make him see reason, and let him begin to understand that the simplistic assault mech lance can be ripped apart with ease. I believe that you are actually doing him a disservice by playing in a manner that gives him a greater chance of winning then he should have. If I were to play against that same person I'm not going to give any cares about feelz. If he loses, which I have played against such simple styles for a long time now, then the loss is going to shatter him into grape jelly. His whole world is going to make zero sense because he should have been given a win. Hes probably going to go home and cry, and lets be honest some people have, once he realizes that hes nowhere as good as he was made to believe.
Do him the favor and shatter his little assault lance so that he is able to grow as a player. If something he is doing does not work well then he should be shown enough respect by assuming that he will not:
1) Refuse to learn
2) Will cry foul because he didn't get his way
Some people will do both of those things, they have and created a big mess for the sake of their tiny little egos and illogical nonsense. Its not fun trying to cater to such fragile people pumped up by years of coddling and pats on the head. I've been there, done that, pulled the plug on that garbage.
In the end it comes down to one thing...
Lose and learn, or learn to lose.