Offensive quip about Covid symptom? (9,4)

'covid symptom?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'offensive quip' is the wordplay.
I cannot really understand how this works, but
'quip' could be 'joke' (I've seen this before) and 'joke' is located in the answer.
The remaining letters 'tasteless' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'about' is the link.

Can you help me to learn more?