I don't think fans will start bashing Ayu. Most Toho fans love her for the support she has shown during a-nation (waving the Toho towel) and for saying that she is a fan herself. Most of them are proud that the Queen of Jpop supports the boys.
Also, don't think all Toho fans leave bad comments to Matsuura. International forums have started several projects to show their support to Matsuura.
Some projects:
1)
[INFO!] Leave your messages/comments for Max Matsuura-san here! (2009-now)
"Our lovely translators have offered to help post O! member's comments into Max Matsuura-san's blog under an account with the name, OneRedOcean. As he has mentioned before, he reads all the comments. Knowing the amount of support he has shown towards Tohoshinki, here's your chance to show your appreciation to him."
2)
[Project] Cassiopeia thanks Matsuura-san! (2010)
"Hey guys,
I've been following Max Matsuura's tweets lately and if you did the same you might have noticed what kind of person he is and how much he did for TVXQ til now.
Even now he's supporting them and hopes that they'll get back together.
Many people write mean comments and accuse him for not doing enough.. or say they're disappointed.
But in my opinion this man did a lot more than anyone! And somehow I feel like he doesn't get enough recognition...
He's not only supporting them but also gives us fans answers to some questions.. what nobody has done before.
Okay some answers are not always clear xD but at least he's replying to messages and is not lying to us. (Like other people do -.-)
Therefore we have decided to make a "thank you" - Video! To show our gratitude and cheer him up.
"
"For everyone who's curious.
We've posted this video on Matsuura-san's twitter and he replied:
http://img143.imageshack.us/img143/8...ixmatsuura.jpg
He also uploaded the video on his blog:
http://ameblo.jp/maxmatsuura/archive1-201004.html
He wrote: 涙がちょちょ切れました。 世界中の東方神起ファンからです。Which means: I had to cry out of happiness and it's because of all of Toho's worldwide fans. (thx Anke for the translation)"
3)
[Trans & Request] 091001 Max Matsuura’s Birthday was on October 1st: Can We Send Him A Birthday Message Together? (2009)