Who said anything about sympathy? The question is whether she's the worst PM, and Tim made the point that she's having to deal with the worst economic and political situation in years. TB is suggesting that doesn't matter, as she chose to, which doesn't make sense.But she didn't have to - so why should be accorded any sympathy, at least on those grounds.
Whomever was PM now would be doing a bad job, because of the situation the UK is in. Now sure you can debate how much better or worse other people would have done, but to suggest that the situation isn't relevant because she chose to take the job is just daft.