To avoid snipe at the end of a board when planing you're doing it right, and I think this is the common way, start with stock longer than the finished size. After planing and gluing are complete - trim to final size. But when 'forced' to use stock close to the final dimension (let me insert here I almost always use a sled to machine plane) the same thickness as my project stock, and add it to sled at the end. Any snipe moves to the scrape stock you added.
When I read the first post I was imagining taking a 2x4 and trimming the end with a miter saw, or whatever, because the end had a defect and then with a hand plane remove the machine marks. If you tools aren't really sharp that can be hard to do.