Not too long ago I was playing a recreational match with a partner. It was very friendly - the opponents were very nice and we were all having a good time.
It was still a competitive match - we were just being sweet.
On the change over right after my partner lost her serve she said to me, "stop being so nice to them you are building up their confidence and they will beat us!" This may or may not be true. But that's not the point.
If I can improve someone's life IN ANY WAY - I will do that. Even if that means losing a tennis match.
Humans first. Tennis after.
We ALL have stressful things going on and a little kindness goes a long way!
We did end up losing the match and she never played with me again. (By the way - she seems to lose with every partner and is going through partners like I go through socks!!)