This is really important LR.
Those that I know who have been most successful in friendship and life are those who are truly agreeable and respectful. They don't 'try' to be agreeable or put on a facade when in public - they are consistently agreeable (pleasant to be around) by their very nature. When you've spent time with them, you leave feeling uplifted.
And for the record, being agreeable or respecting someone else's opinions doesn't mean you have to agree with everything. It's largely about knowing how to disagree without insulting the other person's opinion.