Good to know! At regionals back in july someone kept tapping my cards to 90 degrees (just my attacking creatures) and was a real jerk about it, but I didn't want to bother a judge with it.
The older-school someone is, the more likely they are to tap 45 instead of 90 degrees from what I've seen. It's still legal, though.
Were I called over as a judge to handle that situation, I would have the cards turned to 90 to ensure there was no confusion. It does tickle me to hear people talking about revised like it's the oldest of the old school. Most people 1st got their hands on revised at least a year after Alpha came out. I remember when revised came out, some people who never read the rules somehow misconstrued the new Tap symbol to indicate the degree to which cards should be tapped. This was completely unfounded, as the rules were always clear about what it means to tap a card. Enjoy the
Beta Rule BookYou'll see that it's very clear as to what tapping means. That said, so long as your opponents are not confused by it, it's really not a big deal. Of course, if it's going to bother you when people correct you, it's worth tapping correctly to prevent getting off your game due to aggravation.