Yes, indeed! Based on all the threads we've gotten about how the Wizard class is "overpowered" and can do everything all the other classes can do but "better"... I suspect a whole heap of people do in fact see this bias all the time, LOL!Old school bias that fighters are for new or dumb players and wizards are for veteran and smart players.
These threads are always all about how the Wizard always has just the right spell cast at just the right time to effectively get past all challenges faster and easier than any of the other PCs at the table. Which means that apparently all of these tables must have their most intelligent and tactically-savvy player playing the Wizard character because they seem to know exactly what spells are needed and can cast them at the right times all the time.
But every time I've mentioned that once you just put a mediocre player behind the wheel of the Wizard that suddenly that class doesn't seem "overpowered" anymore... that's treated like an impossibility. The idea of mediocre Wizard play seems unfathomable to them. Which means those biases you mention are still a full-on reality for a lot of people.