Yes - he will be booed at Camden Yards. O's fans (and count me as a lifer) booed loud and clear when Cal would ground into a double play in every crucial situation the last four years of his career. If you can boo Cal when he was the heart of O's baseball, we ceratinly can boo a roid user.
Raffy may have had a great career but he is not a long time Oriole and will be booed. Save for a few thousand die hards, O's fans are, by and large, fair weather and fickle and ONLY care about Boog, Brooks, Jim Palmer, Cal (though Angelos burned that bridge as well), Eddie Murray, Rick Dempsey and a few others from days gone by. When Mussina left for the Yanks, O's fans were legit pissed after Mussina assured everyone for years he would stay in Baltimore forever.
Free agency in baseball makes true die hard fans hard to come by. Raffy is Canseco's bitch.