Love them, yes. As people, as God’s creation. As you would anyone. That doesn’t mean approving of their activities. But love everyone.
Judging is damning someone and believing that you are better than them. Christians know that we are not better, we are saved from our own awfulness.
It is loving to let them know that their soul is in peril and that they need to repent of what is clearly declared in Scripture to be a sin. If they dont repent and accept Jesus atonement, His blood shed for them, they will end up in a lake of fire forever. It IS love to warn them and give them a chance to be saved from eternal damnation.