Practice perfect shields. Crouching while attempting perfect shields increases your chances if the laser goes over you. Crouch, PS>WD or dash depending on distance. I find as soon as you hit them back with a couple, they're way more hesitant to throw them. Hell, sometimes they'll stop throwing them for the whole stock because it's super intimidating to them if you hit 5 in a row.
Once you close the distance on him, focus on staying at a range where he doesn't want to laser or he'll get punished. I find a perfect shield>grab works really well on aggressive Falcos who laser right in your face.
If you want a faceroll solution, get in range and counter a laser and he might see it connect and approach you, and subsequently get hit. But again this is lasers for dummies haha.