True it might be a bit more work, but as a native speaker of English, I trust you will be able to decipher their meaning in all but the most extreme cases. My assumption is that the poster didn't notice them. It isn't a question of laziness. I often couldn't spot a misspelling if it were to poke me in the eye. I don't want us all writing like that, but if someone does, it isn't a big deal to me.
Snoopy Come Home.
But my friend Karen and I trekked down to Kew Gardens just the same. As rain was in the forecast, we donned our raingear and set out. I fear that my fair friend may wake up a ripe shade of lobster tomorrow morning. Perhaps it was in response to the hot weather that we entered the store, perhaps it was because we are two sick individuals. Whatever the reason, we spent the bulk of that free time in a little, air conditioned Christmas shop, peering at snowmen and sleds as the sweat ran down our cheeks.