Human beings are not robots mind you. It is nigh on impossible to expect them to be 100% positive in their support all the time. They react to what is going on around them, when good they cheer, when not good they shout.
It is **** all to do with support or “love” as you felt the need to highlights in inverted commas, it is simply entirely normal and acceptable human behaviour.
Of course it can overspill into nastiness which is never nice but you know we are not unique in that as a football club.