You have such a Yankee-centric view of the world. Here is what he said, after his team won the game and he was still being asked about Tanaka after being asked about it all day:
What he said was hardly disparaging of Tanaka - it was more about the Tanaka talk. And it's true. You beat a team and you're being asked again, after being asked all day, about how great he was? Saying he had been "made a fool of" at the plate is a bit of a stretch too - he swung and missed a lot but he does that. I wish he didn't - hence my OP, but going 1-for-3 is something he'd take all season against anybody, and make the All-Star team.
I also think he said it with a purpose. The media in the AL East is all about Boston and the Yankees and their big stars, and Showalter is doing with this team what he has done with a number of teams - including the Yankees - in his career. Early in his Yankee tenure he went toe-to-toe with Tony LaRussa and the A's at a time when the A's were one of the big hairy monsters in the AL and the Yankees were not the Yankees we've known recently. Showalter went after Girardi last season and I think he, and Jones as a leader of the team, are consciously bristling at the constant Yankee-worship of the sports media world. It's a conscious clubhouse strategy, and IMO a necessary one. The O's shouldn't go into Yankee Stadium in awe and hoping to take a game in a series; they need to march in there with a chip on their shoulder and with a total absence of wonderment or intimidation.