The phrase "all a bit silly" is correct and usable in written English.
It can be used to describe something that seems foolish or not serious, often in a lighthearted or humorous context.
Example: "The idea of wearing socks with sandals is all a bit silly, but it can be fun to break fashion rules sometimes."
Alternatives: "somewhat ridiculous" or "a little absurd".
I thought it was all a bit silly when we started shooting".
I thought it was all a bit silly… The flight attendant left in search of another T-shirt but never returned".Qantas says it has no record of the incident.
She always took his side when I was trying to persuade him he would be a "natural on Twitter," and he felt it was all a bit silly and newfangled.
Of course, he's not the first to get naked in the name of rock'n'roll, but it's been a while since anyone stripped off, for the simple reason that it's all a bit silly.
Our plans to do a panic room, see a dumb movie or eat at the weird new fusion place are all "a bit silly". Instead she just wants to do dinner at someplace deemed nice and an indie movie about sad people being sad — fine if that's her thing, but she never seems to enjoy it, or anything.
The whole weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing weed-still-being-illegal-in-2016-thing
It made us all look a bit silly.
It soured the last few days as it all became a bit silly, with comedians threatening boycotts.
It all seemed a bit silly, to people who had grown up seeing this silent old lady feeding ducks at the lake, or walking in the evenings.
Granted, the pre-production has been a farce; yes, the previews have smacked more of rehearsals and undoubtedly it's all getting a bit silly.
But even if we accept Turnbull's story, it all gets a bit silly, because he only considers sellers and not buyers.
