Not to be picky or anything

...but this has actually been bothering me all day.

There is a definite lack of parallelism in Y's previous statement. It either has to be, "Going to the beach during the 9 days is like EATING frozen cookies" OR

"The beach is like frozen cookies."

Going to the beach cannot be like cookies of any sort, even if they're fake rugelach. Take it from the person who actually goes to the beach, not the non-swimming engineer extraordinaire whose english skills appear to be a bit lacking.