The Hate Me singer said Grennan is her friend and ally and there was no harm in his remark.
Tom Grennan sparked backlash among Brit Awards viewers after commenting on Ellie Goulding's breast plate on stage
Glastonbury was recently criticised for a large price hike.
'Bad Habits' was also the most played song of 2021.
Grennan has been forced to postpone a tour date.
Before becoming a singer, the Bedford-born boy was actually pursuing a professional football career