Do we have to ask if he is eligible?
Seriously, here's the only justification that I believe could be used for issuing a technical foul to a varsity player during the jv warm-ups:
RULE 2 SECTION 8 OFFICIALS' ADDITIONAL DUTIES
The officials shall:
ART. 1 . . . Penalize unsporting conduct by any player, coach, substitute, team attendant
or follower.
NOTE: The home management or game committee is responsible for spectator behavior, insofar as it can reasonably be expected to control the spectators. The officials may call fouls on either team if its supporters act in such a way as to interfere with the proper conduct of the game. Discretion must be used in calling such fouls, however, lest a team be unjustly penalized.