I agree with you. I'm sorry you have bad experiences with Christians. There really are many out there that don't use bullhorns or shame or other egregious tactics, but try to live their lives and treat others with kindness and civility. Many do absolutely amazing and selfless things in this world to make it better, but goodness and self-sacrifice aren't all that interesting to the media, lol. There's a verse, Ephesians 4:15, that says "but speaking the truth in love, we are to grow up in all aspects into Him who is the head, even Christ". There are other similar verses, that seem to be missing from the Bibles of some, I'm sorry to say.  

I have never been tempted to evangelize with pushiness, threats, shame, or bullhorns. And I've never found the verses that encourage that. Just know that the author of the faith, Jesus, was a terrific guy that people couldn't wait to spend time with, and His plan is that His followers would be similarly appealing and pleasant.  Some are, some aren't