Because I'm starting to get annoyed.
1. Dubs do not automatically suck. Sure, some of them are pretty horrible, but some of them are actually pretty good and/or okay. They are also better at making dubs then they were ten years ago.
2. Dubs do not ruin fandoms. Most of the time the fandom is already ruined before the dub even gets there so the dub fans aren't going to change much.
3. Dub fans are not lesser fans then you. You are not better then dub fans just because they got into the anime after you did. It just means you got into faster then they did. Also, the terms 'true fans' and 'lesser fans' need to stop existing.