Meek should not respond that gives Cassidy more momentum he should just let it go.
I'm not a fan of both, but in the end, he needs to take the L and move on. Look at Nicki going after Kim for Black Friday... Not only she gave Kim a HUGE momentum, but she made herself look weak as fu*k every time she kept dissing her and each time she was just looking desperate to be right... when she was just sadly wrong. If Meek response and it doesn't go his way, he's giving him shine and momentum to his own enemy and just proving him right. If he don't respond... People will eventually forget and no one will remember this sh*t ever happen. Let it go, take the L and just keep it moving.