I wear shorts until about 40 degrees and then switch to Sporthills or Nike running pants. There really is no reason to wear tights unless you just like the way they feel.
If you think they are too aggressive, just buy a pair of Sporthills. If you get them in the right size, they are not too tight, yet don't get in the way. They come with or without the stirrups.
or if you prefer Nike, they make all kinds of running pants that are not tights.