Yes, over one tablespoon is more sugar than an adult should have per day. (Not to mention all the added sugar these days.) Maybe an ice cream on the weekend.
I usually combine with a Almond/Coconut milk and it is fine without sweetener. May take a bit to get used to if you have habits to break.
You're probably getting that and more just from additives to food. I'm of the opinion that adding additional sugar to anything isn't exactly the healthiest unless you're cooking everything from scratch and can control the amount of added sugar in your diet.
Some sites say 15, some say 12.5. Tablespoon quantities are typically rounded up to "heaping" as well, so who cares? It is clear from the ancestor post adults are healthier without all this sugar.
But this is another reason why people don't lose weight / get fit / make progress on so many things. 50g / day is fine according to WHO. If that is correct (for argument's sake), we can't then use their 'better' guideline to mean "no adult should".
The perfect is the enemy of the good. People stop trying when they set unrealistic goals for themselves. We don't all need to be hyperfit. Etc.
I have made a ton of personal progress over the last 1.5-2 years in health and several other areas, by being vigilant in refusing to try to change too fast, even for mundane goals. It is important to find the right pace.
I usually combine with a Almond/Coconut milk and it is fine without sweetener. May take a bit to get used to if you have habits to break.