Thing is, even Spurs fans were doing it earlier in the season. That's really baffling. Can't see why they'd have any particular dog in this fight, so to speak.
Could you imagine giving a shit if Spurs had signed a Liverpool player?!
Even more moronic is Everton fans booing Sterling - which they did in significant numbers at Goodison very early in the season and still to some degree a couple of weeks ago.