That meaning of support is a non-countable noun, like water or happiness (or Lego, but lots of people get that one wrong). There is no plural of non-countable nouns.
You might use (for example) “bodies of water”, “levels of happiness”, “pieces of Lego”, or “sources of support” etc.
Silence, bot, the only thing worse than a pedant is one that isn’t even correct.
One thing I’m not loving about going from reddit to lemmy is the amount of pedantry by people stuck somewhere between A and B on this graph.
Never heard of linguistics or prestige dialects, just go around parroting nitpicks they learned in 7th grade grammar classes.