If hearts are the symbol for love, what would you say best fits as the symbol of hate?

Back in the day in the kids' comics I remember at least one occasion where the spade card suit was used for that purpose. (Britain, 1980s/1990s)

A character's speech bubble contained "I h♠te homework" or something similar. Might have been spinach instead of homework. Or school. Anything an irreverent protagonist might not like.

The artist was clearly using this as a counterpart to the more often seen "lo♥e", but as an adult thinking about it now, I have to wonder if the artist had forgotten about the potential racial connotation of using it, or if they hadn't but didn't think it was particularly important.

Either way, ♠ could be used as a symbol of hate if the context permits it. Maybe best avoided if you're looking for a generic one though.