A nice person is that who respects, who’s tolerant and accepts the existence of other people. Are you any different from that? If you are, in any way, a little intolerant, or sometimes you wish others weren’t around you (like that creepy fellow on the bus, that annoying neighbor of yours or a dumb politician in charge), you should at least (out of respect) be respectful, in any way you can. Even lying.
When you lie, you should follow some rules that won’t make you a good liar, but will make you a respectful, decent, liar (maybe on the inside wishing you could tell the harsh truth).