Don’t ignore the effort of a person who tries to keep in touch, it’s not all the time someone cares.
If someone tries to get in touch or keep in touch with you, that means they are concerned about you. They want to start, or maintain a relationship with you.
You should not rush to avoid or reject them. Because, at that moment, they genuinely want to be friends with you. If you decline them a few times, they may make an effort to reconnect with you.
But if you continue to refuse, they will give up and stop. No one wants and is persistent enough to build a relationship by him self.
You may think that the relationship between you two will not go anywhere. But if you haven’t started, how do you know for sure the result. Maybe you will have a good friend, a good relationship.
Therefore, don’t say no to the attempt to connect with someone’s friend.