Ah the perennial tug of war between mind and heart. Kindness flows from the heart. It doesn't know or care whether people appreciate it, or take it as a sign of weakness, it wants to be kind because that is your nature, to be kind. Your mind, the ego, that's the clever one, always looking for number one, being so important, protecting you from being taken for granted, gets insulted when your kindness is taken the wrong way, taken advantage of, or unappreciated.

My advice is know your motives for being kind. If it were to merely to appear as a nice person to gain a benefit (an ego play) then it would matter how it is received, but if it is a natural heart kindness, then really, it doesn't matter. Ask your heart if it cares that you get thanks for a your kindness?

I hope this view may help you not allow your mind to close you up and miss opportunities to connect with good people, because your mind is all bristled up because some others wanted to use your kindness to get one over you.

Blessings