I feel like I took a wrong turn somewhere such that I'm learning all this in my midlife. I genuinely believed the only place for "ruthless competition" was in sports and business, and in theory you know what you're signing up for. The past couple of years have been very eye opening to me, to learn people take such pleasure in such miserable things. (I also didn't know about this till recently: https://www.quora.com/What-are-fair-weather-friends)
Yes. I, too, learned this the painful way. I had many friends, or so I thought. Then I got cut out of a volleyball friend group because I was too “intense” (aka talked about things that weren’t the weather) for them. Okay. That hurt a lot.
Lots of thinking later, and I can now tell the difference between acquaintances and friends. There’s a simple test: acquaintances will be there when you want them to; friends will be there when you don’t want them to, but need them to anyway. An acquaintance would never do that.