Why RED BUBBLES are impossible… or are they?!

I didn't understand the part where the vídeo says that you need lasers to see interference. The whole video talks about interference with regular light. Also if you use two independent lasers of the same color you typically won't see any interference as the phases are independent (i am not considering fancy lasers with fancy fast photon detectors). Finally you can observe the double slit interference with white light (but I don't know if any white light is sufficient) . I am not sure how Young first did it but he didn't have lasers and probably still managed to convince people