I don’t think of kindness as something where anyone can take advantage. Kindness doesn’t require an exchange. You can be kind without giving up anything and without appearing weak. You can be kind to every person the same without risking anything at all for the sake of being kind.

You should use the same caution with people that you always would. You should expect people to show you the same kindness that you show them. You should set boundaries and not tolerate disrespect. Nothing changes in this regard depending on kindness.