Its directly relevant to the subject of the thread with the implication that people shouldn't vote Labour because of it so lets compare the behaviour both of individuals and the party.
Rupa Huq made a racist comment - Labour immediately removed the whip, she has apologised directly to Kwarteng and in public for the comments (not how people feel about the comments, the actual comments).
Now lets look at a small selection of comments from the recent leader of the Tory party, all dismissed, excused and laughed off both by Johnson and the party, no penalty incurred at all (not my list incidentally, a commenter elsewhere had grouped them together already):
“tank topped búm boys”
“watermelon smiles”
“ flag-waving piccaninnies,”
“ they chose to “go around looking like letterboxes”
“ the Muslim world being “literally centuries behind”.
“ they have an almost Nigerian interest in money and gadgets of all kinds.”
“ I come across that bunch of black kids, shrieking in the spooky corner by the disused gents,”
“ The interesting thing about his half-caste looks, he decided, was that he didn’t look Negroid.”
There is plenty of racism, sexism and classism on the authoritarian left, just as their is on the right. Currently Starmer is putting a lot more effort into dealing with racism whilst the Tories pretend it doesn't exist and perpetuate class based politics.