Respectful is a description of people who accepts others, never discriminate and have a good attitude towards everyone no matter who they are or where they are coming from.
In my opinion, everyone deserves some respect, even if you don’t usually agree with what the others say and even if they don’t like you , you should always show a good behaviour wherever you go.
We are all humans who have different opinions and there is a lot of stuff to disagree on in life even with the closest people we know.
At the end, when you respect people, you will definitely find people showing respect for you back. And if you don’t, you still have respect to yourself.