Not if it’s true.
Of course, there’s only one way to find out. :)
Telling people on a sinking ship they will drown if they don't get in the lifeboat is that mean or vicious?
To those who trust their very lives to the One who created them Jesus Christ is their lifeboat.
As a part of a ministry that provides services in group homes, nursing homes, and assisted living facilities I am often asked who I am affiliated with... Catholic? Jewish? Baptist? When people ask that question I always reply, "I am merely a Christian." As a Christian I am not better, but I am forgiven by the amazing grace of Jesus. IJN
It’s more of a helpful suggestion, or warning.
Not if Hell is an unpleasant reality. Your conclusion only makes sense if there is no Hell. If there is Hell, wouldn't telling someone how to avoid it be the kindest thing you could do?
It's kind of like telling a child not to play in the river because they might drown. If the child desperately wants to play in the river, that a seems a nasty, even vicious thing to say because the child doesn't believe the river is dangerous. But is it actually nasty and vicious to warn the child of the danger?
The only difference between your reaction to the two situations is that you accept the river might be dangerous but you don't accept there is Hell. So we are really not discussing kindness or nastiness. We are discussing Truth.