I've had the same thing and it is tendonitis and your training partner is 100% WRONG. It is something to worry about because if you don't let it heal up properly you'll be dealing with major arthritis in your forearms as you get older (ask any doctor). Stop doing exercises that hurt your forearms first of all. Do dumbell curls for your biceps as an example so you minimize the strain on your forearms. Wrap those babies up with ace bandages at night and maybe even during the day if you want but at least at night. Ice is a an OK idea too. Took me about 2-3 weeks until the pain went away from just moving my wrists and about 3 months or so until I had no pain whatsoever from doing barbell curls and I didn't do any barbell curls again until it was fully healed and still I don't do much in the way of barbell curls. I stick mostly to dumbells and cables since they don't hurt my forearms near as much. Forearms are better worked at higher reps and lower weight as the tendons can't take that high weight plus the muscles in the forearms are more like the calf muscles in that they respond well to high reps. Good luck and know that it will take some time to get those things back healthy so take it easy on them.
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