I grew up in a normal non denominational evangelical church and about once a year there was a sermon warning about the Jehovah witnesses. Its wasn't hate filled or anything. They basically told us that the WTS is a stupid cult teaching a false gospel that destroys lives and families.
It is really shocking how hate filled the WTS is when you are raised away from it. For everything other churches say about the WTS , it is literally 100X worse coming back.
Hell, I would have to say about 25% of what is taught now in the KH is just villainizing ex members or other Christian sects.