Jesus loved everyone and so should we. We should never ignore anybody or leave them out because they aren't 'good enough' or they're not living the life that God has planned for them. You should love them just like God told us too, but... that doesn't mean you should listen and take everything that they do. Also, you certainly should not join in what they do if it dishoners God.
The key is to respect other people (sinners) but not spend heaps of time with them and always stay rooted in God's love and his word (the Bible). You should interact with sinners to show them God's love.
