The sayings of Jesus had double effect. Humor to those to whom they did not apply, and hurt to those who they did. Looking at the method Jesus used, it was not an avoidance of insult at any cost. Jesus did not always respect those who were opposed to Him. In fact a number of times he down right insulted them:
Mat 13:57 And they were offended in Him.
Mat 15:12 Then His disciples came and said to Him, Do You know that the Pharisees were offended when they heard this saying?
Joh 6:61 When Jesus knew in himself that his disciples murmured at it, he said unto them, Doththisoffendyou?
Joh 6:65 And he said, ThereforesaidIuntoyou,thatno mancancomeuntome,exceptitweregivenuntohimofmyFather.
Even the apostle Paul offended people when he said they'd go to hell unless they repented.
The scriptures you quote about love are true but unfortunately this kind of love that you take it to mean, does not mean bending over backwards to avoid insults according to the standards of our over-zealously politically correct , tolerant and "over-sensitive to feelings" culture. It is a false kind of respect you speak of. How can we respect someone who insults God? We must not respect them otherwise we are part in their evil ways. To respect implies to give some kind of excellence, honor, or worth. There is no honor or excellence in a person who insults Christ and calls your mother a whore. Too many people today worry too much about offending others. Jesus wasn't so worried. He said his teachings would divide families, he came to bring a sword. If we preach the same teachings Jesus did, it will have the same effect. It will offend people, it will divide families, it will be like a 'sword', even when you don't intend it. But then you must not turn around and say whoopsie, I offended this person with the Gospel, "I'm sooo sorry for hurting your feelings". No, that's not the way Jesus did it at all.
If we don't treat people with respect, how do we win them to Christ? Quite simply, it is not us winning them to Christ, it is not merely our words that brings people to repentance but God's power. Too many people are worried about saying that one little word that's going to turn off a person from Christ for life. That is rediculous. The way Jesus showed us as our example, is to tell things how they are. Not using sarcasm or insults when certain situations may call for it, is like trying to fight a dragon with a feather duster. They're just another tool you can add to your tool-kit as an evangelist. To a wordly person, saying "you've just insulted me but Jesus and I love you anyway, kissy kissy" may be more offensive to them and turn them off Christianity as easily as calling them a "white washed wall".