Don't waste your time on fools.

And as you go, preach, saying, "The kingdom of heaven is at hand. "
Heal the sick, cleanse the lepers, raise the dead, cast out demons. Freely you have received, freely give. 

Now whatever city or town you enter, inquire who in it is worthy, and stay there till you go out. And when you go into a household, greet it.
If the household is worthy, let your peace return to you. And whoever will not receive you nor hear your words, when you depart from that house or city, shake off the dust from your feet. 

Assuredly, I say to you, it will be more tolerable for the land of Sodom and Gomorrah in the day of judgment than for that city!

Behold, I send you out as sheep in the midst of wolves. Therefore, be wise as serpents and harmless as doves.
~Jesus. Matthew 10:7-16

Do not give what is holy to the dogs; nor cast your pearls before swine, lest they trample you underfoot, and turn and teat you in pieces.
~Jesus. Matthew 7:6

Choose your battles wisely, friends. 

"Apply energy only to those things we can change. [Don't] beat [your] head against an unbreakable wall. " (John Maxwell)