I don't buy the premise of this meme at all. I would have agreed with it years ago, but things are quite different today. The Republican Party has embraced racism, sexism, economic injustice, and cruelty towards the weak or needy. In addition to that, they are dismantling our democracy and lean dangerously toward fascism.
This is not just a difference of opinion anymore, it's a moral crisis for our country.
I have a problem maintaining a relationship with those whose core values are in complete opposition to mine... racists, religious bigots, homophobes, islamophobes.... people who are on the opposite sides of the issues I find critically important. It's hard to have a conversation about anything where these differences don't interfere and cause problems, so any relationship I have with these people would be superficial and meaningless.
If what someone believes is detrimental to others, it isn't enough to disagree with them. They must be opposed. I have no problem with Christians per se, but when they try to make laws based on their beliefs that are demonstrable to be harmful to others, i will oppose, i will resist, i will fight. Same goes for any view point.
These things exist because views and beliefs usually come grouped together and if you find one repugnant you'll probably find the rest repugnant. If it is something like dems and reps, it is usually a matter of presenting a United front. The same reason you can pick on your sibling, but if anyone else does you'd beat em down.
Esp the love someone part. Loving someone should include being able say that a choice they are making is detrimental their growth and they still feel loved. Some in our society have been bred believe if anyone has an issue with their choices it's an attack.