I don't think any of us really expect Thistle players to be Thistle fans, certainly not in the same way we are. However I do expect Thistle players to have enough professionalism not to flap their big, stupid, drunken mouths in public about their love for another team. It's extremely disrespectful to the club and it's supporters.
I remember some time ago Chic Charnley receiving pelters from Jags fans in the terracing during his warm-up the Saturday after a cringeworthy article in the Evening Times where he declared his undying love for Sellick. He looked suitably embarrassed and contrite.