The no capitalization makes it hard for me. I think just re-writing with capitalization makes it a lot easier to read:

Note to UI designers. When reading a long piece of text. I select the text while I read it. I select the text while I read it!. I select the text using my mouse. While I read the text I often select the text. I don't want to perform actions on the text. I don't want to accidentally click share link. I want to select the text while I read it.

Here's how I would mildly edit the punctuation in order to make it easier to read:

Note to UI designers; when reading a long piece of text, I select the text while I read it. I select the text while I read it! I select the text using my mouse. While I read the text, I often select the text. I don't want to perform actions on the text. I don't want to accidentally click share link. I want to select the text while I read it.

Here's how I would have conveyed the thought in a JIRA comment:

UI designers could you please, for the love of all mankind, stop fucking putting fucking shitty ass popups in the god damn non-mobile website! There is no one, and I mean no-fucking-body, that is still using a desktop computer in 2025 that does not know about ctrl-c and ctrl-v. There is not sane reason for you to ever assume a user wants to visit some shitty twitter/reddit/digg/blog when they select text on a desktop computer. If I see a single one of you motherfuckers putting fucking text inside an action I swear to god I will come down there and beat you to death with your own fucking keyboard.