It’s become such an issue with kids running on pitches for shirts that several clubs ended up banning parents, so guess it bothers clubs. Slippery slope and all that.
A player feigning to give his shirt to one of those god awful kids holding up a placard with “(name) can I have your shirt”, only to pull away at last moment and walk back to dressing room with it and a great big ‘feck you’ smile aimed at the entitled little prick :)