“DENTIST by mistake”, "A TEMPEST at the Lake". Yes that sounds like a perfectly plausible miscommunication.
The negative comments aren't about the aircraft specifically but rather towards the way they end up being used. Unfortunately the unlimited availability at the lake, its monster speed, resilience to damage and heavy armament tempt some players to take the shortcut of exploiting the planes more obvious attributes in place of all that tedious learning ACM business. It's an obvious solution in a overly results focussed culture.
The objection is that many players spend a lot of time learning ACM and testing their skills in actual dogfights, only to have those fights ruined by one or more Tempests barrelling flat out through a furball or even just a two plane fight, to shoot anything that falls into their gunsight.
Wasting other player's time, over and over again, and then worst of all talking smack about it or proudly landing 'victories' is likely to make you unloved, shall we say.