I reckon the first half of Iwobi's everton career was deffo up there. 2nd half he was one of the most popular. Barry Horne and Mark Pembridge similar, top of my head.

Play generally shite (or worse give an air of not trying) and you get the bird, don't play generally shite and you don't. There's other factors as well of course, how well the team is overall doing etc...frustration and anger rightly or wrongly manifest themselves in different ways. It's all part of the package (again im not condoning it) of playing in stadiums in front of tens of thousands of people. It's happened since time began and will happen forever. If you don't like the heat, etc...to suggest things could and should be otherwise is lovely, but utopian.