You fuck up the mate. And you don’t even realize it.
You don’t even know what you don’t know. From curing the mate (that’s the cup, not the yerba — are you lost already?), to filling it, to the water temperature (must.be.perfect.), to the rotation, the timing…and I bet you had the great idea to say gracias when someone handed it to you, to show your appreciation. Gracias means you’re bailing and you don’t want any — so don’t wonder why they don’t include you after.
Do everyone a favor, and until you know what’s up, just shut your mouth, don’t play with the straw, drink it quickly when handed to you no matter how much it scalds your mouth, and pass it back to the same person who gave it to you.