Hey, dw about spamming questions I am happy to answer them, and to answer your Q I think so yes. But don't worry building tendons is actually really easy it just takes time, the formula is low weight and frequency. If this is your first time working out ever, expect 2-3 months from the first time you broke a sweat. Do incline pressups on some stairs for example or the knee pressups, just crank out a few every now and then each day, believe me this stage will pass by like nothing.
Be kind to yourself, you're building your foundations, completely forget heavy weights for now because tendons do not work that way. And make sure to work out core and legs believe me they will improve your QOL
The individual you interacted with sounds like a deeply unserious person. Just keep growing and try your best to ignore them because that will take time away from yourself. Unfortunately I don't doubt they will involve themselves more into your life even if its little annoying moments like these, however just remember this person will never matter that much so just do you <3