I mean they can tell whatever they want. I organized my work around the fact that I can tell people to go fuck themselves when they are uncooperative in these small but very important ways. Obviously that's not the reality for ~90% of people today.
But people shouldn't take "workspace" abuse from others. Be polite, assertive, constructive. Give them credit for taking the time to care a bit about this problem, offer to debug with them later, try to demonstrate it - switch to speaker, capture what you hear. Alternatively just switch off voice and type. Tell them that the sound is garbage for you so you switched for typing. Try to do quick 1-on-1s instead of the group call, even offer to write a summary after.
This is basically the equivalent of constantly not giving a fuck about how loud one is in an open office. There ought to be proper channels [ha, no pun intended] to address and solve these.