I think Calibre is lovely and it is getting better (mostly)
I cannot see much point in taking excessive umbrage at a users suggestions/complaints as being really a valid use of ones time and mental energy.
Certainly it has discouraged me from providing feedback recently and no one has been belligerent or offensive to me personally.
A lot of work has gone and is going into Calibre and if it had stopped at the first version I used (around 6.42) it was still way beyond anything else I have tried and I have tried a few.
It is human nature to poke holes in perfection and occasionally this results in improvement (oxymoron).
I somehow doubt the op meant to be offensive. (me either
)